Thermal Heated Base Layer Vest By Boss - 300-HV100The active fit (one size fits all) heated waistcoat includes two way locking Velcro straps, easy to adjust for a secure, unrestricted fit for any body type. Utilizing innovative flexible heating panels built into the chest and back, with three available heat settings that provide long lasting, reliable warmth at the press of a button. Designed to warm and maintain core body temperature, the breathable soft shell material provides lightweight comfort